UN Rod Seals

Engineered for brutal operating environments, the UN Series Piston Rod Seal delivers uncompromising performance in forestry, mining, and off-road equipment. As a one-acting sealing element made of 93 Shore imported polyurethane, this hydraulic cylinder rod seal masters extreme conditions while maintaining industry-leading low friction at start-up pressures.

Technical Specifications & Design Advantages

Performance Advantages

1. Mobile Machinery Optimization

• Low-Pressure Efficiency: 60% lower breakaway force vs. standard seals

• Heavy-Duty Synergy: Enhanced sealing when paired with RS step seals at 32 MPa

• Shock Absorption: Withstands 25 G vibration in rock drilling equipment

2. Extreme Environment Resilience

• Arctic Performance: -30°C cold-start elasticity (tested on John Deere forestry cranes)

• Abrasion Resistance: 3x lifespan in silica-rich mining environments

• Chemical Stability: Resists hydrolysis in water-glycol emulsions

3. Critical Applications

• Logging Equipment: Grapple cylinder rod seals

• Mining Shovels: Dipper arm hydraulic systems

• Off-Highway Vehicles: Articulated dump truck steering cylinders

Installation & Engineering Protocols

Pressure-Specific Requirements

• <20 MPa: Standard groove installation

• ≥20 MPa: Mandatory steel retaining ring (ISO 6194 compliant)

Installation Best Practices

1. Groove Finish: ≤Ra 0.4μm (DIN 3761)

2. Edge Preparation: 0.5mm chamfer minimum

3. Lubrication: Polyurea grease (compatible with PU)

4. Damage Prevention:

   • Use installation sleeves for rods <40mm

   • Never stretch beyond 150% of original diameter

Failure Prevention Features

• Anti-extrusion ridge design

• Thermal-stable formulation (-30°C to +80°C)

Industry Validation & Ordering

Ordering Reference

• Rod Ø50.0mm → UN 50 65 10 (65mm OD × 10mm width)

• Custom Sizes: UN [Rod Ø][OD][Width]

Compliance: RoHS 3 • REACH • ISO 3601-3